JPH01130903A - Stapler device - Google Patents

Abstract

PURPOSE: To prevent interruption due to a stapler jam and to improve an operation efficiency by providing an overload detecting means which detects an overload on the occasion of driving a wire pressing part and a drive part reversely-rotating means which makes a control to pull back the wire pressing part to a standby position from a binding position. CONSTITUTION: A stapler gear 15 rotates, driven by a motor 12, and thereby a plunger 16b is moved to a binding position, strikes a stapler wire 22 into a sheet S, conducts binding and fastening and is moved to a standby position. On the occasion, it is discriminated whether or not a sensor cam 27 rotating synchronously with the stapler gear 15 makes one rotation from a home position (standby position), where it turns a microswitch 29 ON, and returns to the home position within a prescribed time. When it does not return, the motor 12 is rotated reversely to pull back the plunger 16b to the standby position until the sensor cam 21 is returned to the home position.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electric stapler device for binding sheets with staples.

(0) Prior Art Conventionally, electric stapler apparatuses include a staple cartridge containing a large number of staples, a needle pressing section for driving these staples into sheets, and a driving section such as a motor for driving the needle pressing section. A stapler is driven into the sheets inserted at the binding position using a needle pressing section driven by a motor or the like to staple the sheets.

(c) Problems to be Solved by the Invention By the way, the above-mentioned electric stapler device may, for example, staple more than the allowable number of sheets at once, or may accidentally re-staple a previously stapled location. When punching a thick or hard sheet with a needle, a drive unit such as a motor may be subjected to a load that exceeds its capacity, causing it to stop midway. In such a case, the device is stopped with the needle pressing part caught in the sheet, and in order to remove the sheet, the operator must manually operate the device to release the needle pressing part. This has the disadvantage that it requires a cumbersome additional operation, as the drive must be moved to pull back the needle pusher. In addition, especially when the stapler device is installed in a sorter or the like that processes sheets continuously, stopping the device interrupts the continuous processing, which significantly impedes work efficiency.

Therefore, the present invention provides a configuration in which a predetermined overload of the drive unit that drives the needle pressing unit is detected, and before the drive unit stops midway, the drive unit is reversed to pull back the needle pressing unit, The purpose of this is to resolve the two-pronged problem.

(d) Means for solving the problem The present invention has been made in view of the above circumstances, and has been made in accordance with the first aspect.
When shown with reference to the figures or FIG. The stitching needle (22) is attached to the stitching needle (22) or seams 1 to (
a needle pressing section (16b) that presses the needle S) to bind and fasten the needle pressing section (16b); a driving section (12) that drives the needle pressing section (16b);
A stapler device (1) comprising: overload detection means (29) for detecting a predetermined overload occurring in the drive section (12) when driving the mechanical pressure section (16b); The rotation of the drive unit (12) is configured to be able to be switched between forward and reverse directions, and the drive unit (12) is configured to rotate in the forward and reverse directions. ) and drive unit reverse rotation means (30a) for controlling the mechanical pressure unit (16b) to rotate in the opposite direction so as to return it from the binding position to the standby position. It is.

(E) Function Based on the above-described configuration, when the sheet (S) is inserted into the binding position, the needle pressing part (16b) is driven by the drive part (12) to move to the binding position, and the sheet is Drive the staple (22) into (S) and move to the standby position. Then, when driving the staple (22) into the needle pressing part (16b) or the sheet (S), for example, if more than the allowable number of sheets (S) are inserted into the binding position, the needle pressing part (16b) is pressed. The drive unit that drives (
When a load (predetermined overload) exceeding a preset value is applied to the drive unit (12) and the overload is detected by the overload detection means (29), the drive unit (12) rotates the drive unit reverse rotation unit (30a). The needle pressing portion (16b) is driven to be pulled back by rotating in the reverse direction under the control of the needle pressing portion (16b), thereby pulling the needle pressing portion (16b) back from the binding position.

Note that the above symbols are shown for reference and do not limit the configuration in any way.

(F) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the stapler device 1 includes:
The stapler apparatus 1 includes a base 2 that supports the entire stapler apparatus 1, and an upper unit 5 and a body 6 that are swingably supported on the base 2 via a hinge shaft 3. A lower jaw 7 having an anvil 4 at one end is rotatably supported on the base 2 via a fulcrum pin 7a, and the several jaws 7 have a cam-shaped groove 7b formed at the other end. , the fi7b
The caulking shaft 5a of the upper unit 5 is engaged with the upper unit 5, and the upper unit 5 rotates about the fulcrum pin 7a as the upper unit 5 swings. Also, from the base 2 to the upper unit 5, there is a crank arm 9.
One end of the crank arm 9 is rotatably supported on the base 2 via an arm shaft 11, and the other circular end 9a is pivotally supported on the upper unit 5. It is rotatably fitted to the support shaft 10 via an eccentric ring.

Further, a motor 12 that can rotate in both forward and reverse directions of the drive source of the device 1 is arranged above the upper unit 5.
A motor gear 13 is fixed to the output shaft 12a of the motor 12, and the motor gear 13 is fixed to one end of the support shaft lO.
A stapler gear 15 that meshes with is fixedly provided, and the support shaft 10 is connected to the motor 12 via the motor gear 13 and the stapler gear 15. When the motor 12 rotates, the support shaft 10 rotates, the eccentric wheel rotates eccentrically, the upper unit 5 is pulled or pushed by the crank arm 9, and is swung about the hinge shaft 3 as a fulcrum. .

Further, - above the body 6, a head portion 16a is provided at an upper portion;
A driver 16 is provided with a plate-shaped plunger 16b at its lower part.
The upper unit 5 As a result of the rocking, the plunger 16b fitted into the body 6 is moved up and down so as to be pushed in or pulled up.

Further, as shown in detail in FIG. 3, the body 6 is provided with a needle cutting member 17 having an opening 17a at the plunger insertion position of the driver 16, and adjacent to the needle cutting member 17. A needle feeding member 19 having an elastic portion 19a and a needle feeding pawl 19b at its lower portion is disposed, and the needle feeding member 19 is movable about a fulcrum 19c. Further, at a position facing the opening 17a of the needle cutting member 17, a needle bevel block 20 having a holding groove 20a for holding the stapler needle 22 is disposed so as to be movable from side to side. The block 20 is urged toward the needle cutting member 17 by a spring 21. Further, adjacent to the needle feeding member 19, a staple cartridge 23 stores a large number of stapler staples 22 connected in a band shape.
The stapler cartridge 23 has a leaf spring-like needle valve 25 fixed thereon which presses the stapler needles 22, and the stapler needles 22 connected in a band shape are fixedly attached to the stapler cartridge 23.
Hold with appropriate pressure. In addition, the plunger 16
A U-shaped bending block 26 is arranged adjacent to b,
When the plunger 16b moves downward, the block 26 is pushed down by a predetermined amount by the pushing claw 16d of the plunger 16b, and when the plunger 16b moves upward, the block 26 is The protrusion of the block 26 engages with a long hole or the like of a predetermined length and is pulled upward.

The pushing pawl 16d is designed to be removed from the U-shaped bending block 26 by pushing the block 26 by a predetermined amount.

The U-shaped bending block 26 is provided with a protrusion 26a, and when the block 26 is pushed down as described above, the protrusion 26a presses the needle feeding member 19, causing the needle feeding member 19 is distorted as shown by the chain line and its needle feed claw 19b is moved in the opposite direction to the needle feed direction, and when the block 26 is pulled up and the pressure is released, the needle feed member 19 is moved by the action of the elastic portion 19a. After returning, the needle feeding claw 19b feeds the stapler needle 22 at this time.

Then, when the motor 12 rotates and the upper unit 5 is pulled by the crank arm 9 and moves downward using the hinge shaft 3 as a fulcrum to press the head portion 16a of the driver 16, the driver 16 is also pushed and moves downward. Then, it is further pushed by the body 6 or the try bar 16 and moves in the X direction using the hinge shaft 3 as a fulcrum, and at the same time as the try bar 16 moves downward, the lower jaw 7
The body 6 moves in the Y direction using the fulcrum pin 7a as a fulcrum.
and the lower jaw 7 is the binding position for binding the sheet S.
Face each other across the two sides.

On the other hand, the stapler needles 2 stored in the staple cartridge 23
2 is the needle cutting member 1 using the needle feeding claw 19b of the needle feeding member 19.
7 is sent to the needle-faced block 20 through the opening 17a,
The most advanced needle 22a connects the central part to the needle-faced block 20.
When the driver 16 is pushed down and the plunger 16b is pushed down, the stapler needle 22 held by the U-shaped bending block 26 pushed by the pushing claw 16d or the staple bevel block 20 is held in the holding groove 20a of the driver 16. Press and bend both ends into a U-shape (see Figure 4). Furthermore, the plunger 16
b is pushed down, the pushing pawl 16d comes off the U-shaped bending block 26, only the plunger 16b is pushed down and reaches the tapered part of the needle-faced block 20, and the needle-faced block 20 is not pushed away, resulting in a U-shaped bending block 26. Only the cutting edge needle 22a that is bent is sheared between it and the needle cutting member 17, and the needle 22a is driven into the sheet S, and is further pressed against the anvil 4, so that both ends of the cutting needle 22a are cut into a flat plate shape. Squeeze it and staple the sheet S. Then, the upper unit 5 moves upward, the try bar 16 is pulled up, and the plunger 16 is pulled up.
b moves upward and returns to the standby position, and body 6
Then, the lower jaw 7 is moved to the standby position, and one step of binding and stopping the sheets is completed.

Note that one rotation of the stapler gear 15 completes one stroke.

Furthermore, when the plunger 16b returns, the next stapler needle 22 is fed into the holding groove 2a of the needle bending block 2o, in preparation for stapling the next sheet S.

On the other hand, as shown in FIGS. 1 and 2, a sensor cam 27 having one protrusion 27a on the outer periphery is fixed to the other end of the support shaft 1O, and a sensor cam 27 is fixed to the other end of the upper unit 5. A microswitch 29 is disposed at a position facing the sensor cam 27, and when the stapler gear 15 rotates once due to the rotational drive of the motor 12, it is detected that the sensor cam 27 rotating in synchronization with the stapler gear 15 rotates once. The plunger 16b of the drive bar 16 is pushed from the standby position at the -1- limit to the binding position, and is further pulled up from the binding position to return to the standby position, thereby detecting the end of one stroke. .

Note that the reference numeral 32 in FIG. 3 is a staple detection sensor that detects the presence or absence of staples.

Further, the control section 3o of the stapler device 1 includes a drive section reverse rotation means 30a, and the drive section reverse rotation means 30a includes:
If the microswitch 29 does not detect one rotation of the sensor cam 27 that rotates C0 in synchronization with the stapler gear 15 within a predetermined time, and it is determined that the motor 12 is in an unacceptable overload state, the driver 16 The dryer 12 is reversely rotated so as to return the plunger 16b to the standby position.

That is, in the stapler device 1, the driving force of the motor 12 is transmitted to the stapler gear 15 via the motor gear 13,
When the stapler gear 15 shifts by one rotation, one stroke of sheet stapling is completed. And the stapler gear 15
The force required to rotate the sheet S varies as shown in FIG.
The force required between the stapler needles 22 and the sheet S varies depending on the quality, thickness, number, etc. of the sheets S, and the maximum force W0 when the stapler needles 22 penetrate the sheets S naturally also varies.

For example, the maximum force W when penetrating the sheet S
, or the maximum force W□ generated when the anvil 4 is used to crush the needle 22 from a U-shape to a flat plate shape at both ends. If it exceeds the maximum force WIllaX, the movable capacity of the Chiyo 12 may be greater than the maximum force WIllaX, or the movable capacity of the motor 12 may not be able to drive it completely, and in that case, the rotation of the motor 12 will be mechanically stopped. Therefore, before the rotation of the motor 12 stops, the motor 12 is reversely rotated so as to pull back the plunger 16b to avoid the rotation of the motor 12 from stopping.

In FIG. 5, a8 is the time from when the plunger 16b starts rotating until the stapler 22 reaches the surface of the sheet S, a2 is the time during which the stapler 22 penetrates the sheet S, a3. a...

a5 is the time from when the tip of the stapler needle 22 penetrates the sheet S until it begins to be bent by the anvil 4, and a6
is the time required for the stapler needle 22 to be crushed from a U-shape to a flat plate shape.

Moreover, FIG. 6 is an electric circuit block diagram according to this embodiment,
A well-known microcomputer (CPU) 30 having a built-in program for controlling the sequence in time series as a control unit and the drive unit reverse rotation means 30a is used as a control unit A, B, and C.
, D, forward/reverse driver 31, micro switch 2.
9, connected to the needle detection sensor 32, etc. Terminals A and B are output terminals that output a signal to the forward/reverse drive bar 31 to rotate the motor 12. When the A terminal output is on, the motor 12 rotates forward and normal stable operation is performed, and the B terminal output is When turned on, reverse operation is performed in the event of an abnormality. Normally, when the plunger 16b is in the standby position, the microswitch 29 is in an energized state (on state), and this state is C
input to the terminal. The forward/reverse driver 31 is constructed so that the motor 12 is stopped immediately when the microswitch 29 is turned on, regardless of whether the motor 12 operates in the forward or reverse direction. in the lowered position. That is, a reliable stapling operation and ease of processing after a reverse rotation operation are guaranteed. A signal from the needle detection sensor 32 is input to the D terminal.

The operation of this embodiment will be described below along the flow shown in FIG.

When it is determined that the stapling operation has started (Fl), motor 1
A forward rotation signal is output to 2, and the motor 12 rotates forward (F
2). Then, the stapler gear 15 is rotated by the motor 12, and is moved to the stapling position by the driving force of the plunger 16b or the motor 12, and at this position the stapler gear 15 is rotated.
2 into the sheet S, the sheet S is stapled, and the sheet S is moved to the standby position. At this time, the sensor cam 27, which rotates in synchronization with the stapler gear 15,
Turns on from the home position (standby position) and stays at the home position for a predetermined time T (for example, 0.81
e. ) or not is determined (F3). If,
If it returns within the predetermined time 1, the motor 12 is stopped and the operation is completed normally (F4). Further, if the sensor cam 27 does not return to the home position even after the predetermined time T has elapsed, the motor 12 is reversed so as to pull the plunger 16b back to the standby position until the sensor cam 27 is returned to the home position (F5).

Note that the reverse rotation speed of the motor 12 does not have to be as rapid as during stapling operation, and may be slower than the normal rotation speed.

Furthermore, even if the reverse rotation of the motor 12 is commanded, the gear unit
Alternatively, if the plunger 16b does not return to the standby position due to a failure of the motor or the like, the motor 12 may be stopped and an abnormality signal may be sent to stop the apparatus.

Further, although the present embodiment has been described using a general electric stapler device, the present invention is not limited to this, and the present invention can be applied to a finisher that is connected to a copying machine etc. and automatically performs stapling work, and a sorter with an automatic stapler. It can also be applied to attached items.

Further, in this embodiment, the overload of the motor 12 is detected from the time taken for one stroke of the stapling operation, but the present invention is not limited to this, and the current value of the drive unit such as the motor that drives the stapler device is measured, When the overload exceeds a predetermined value, an overload of the drive unit may be detected and the drive unit may be reversed.Furthermore, a pressure sensor or the like may be provided in the needle valve pressure unit for driving the stapler, such as a plunger. The drive may be reversed when the pressure exceeds a tolerance.

(g) As described in detail, according to the present invention, there is provided an overload detection means for detecting an overload height of the drive section, and a mechanism for reversely rotating the drive section based on the detection by the overload detection means. Since the drive unit reverse rotation means is provided, when an overload occurs in the drive unit, the overload is detected and the drive unit is reversely rotated before the drive unit stops to prevent stapler jams. It is possible to automatically prevent the device from stopping.

Therefore, it is possible to provide an easy-to-handle device that does not require the troublesome additional work of manually moving the drive unit to clear jams, and which is particularly suitable for use with post-processing devices such as system machines and copying machines that perform continuous operations. The stapler eliminates interruptions due to stapler jams during work, improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a front view of a stapler device according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a detailed sectional view of the body.
FIG. 4 is a perspective view showing stapler bending, FIG. 5 is a diagram showing fluctuations in the driving force of the motor, FIG. 6 is an electric circuit block diagram, and FIG. 7 is a flow chart. DESCRIPTION OF SYMBOLS 1... Stapler device, 12... Drive part (motor), 16b... Side rod pressure part (plunger), 29... Overload detection means (micro switch). 30a... Drive unit reverse rotation means. Figure 1 ↓ Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 TART Stay N. Yes Motor forward rotation F2 °H, p again Yes F3
F4N. Yes 7) Ar1 Motor 0
FFN. Hair - Yushiba Ten

Claims (1)

[Claims] (1) A stapler that staples the sheets, a needle that moves between a binding position to staple the sheets and a standby position, and presses the stapler at the binding position so that the stapler staples the sheets. A stapler device comprising a pressing section and a driving section for driving the needle pressing section, comprising: overload detection means for detecting a predetermined overload occurring in the driving section when driving the needle pressing section; The drive section is configured to be able to switch rotation between forward and reverse directions, and the drive section moves the needle pressing section to the binding position based on the overload detection by the overload detection means. A stapler device comprising: a drive unit reverse rotation means for controlling the drive unit to rotate in a reverse direction so as to return the stapler device to the standby position.